Auto merge of #107498 - JohnTitor:rollup-2i6g4uk, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - #107245 (Implement unsizing in the new trait solver)
 - #107445 (Remove `GenFuture` from core)
 - #107473 (Update books)
 - #107476 (rustdoc: remove unnecessary wrapper `div.item-decl` from HTML)
 - #107477 (Migrate last part of CSS themes to CSS variables)
 - #107479 (Use `ObligationCtxt::new_in_snapshot` in `satisfied_from_param_env`)
 - #107482 (rustdoc: remove meta keywords from HTML)
 - #107494 (fix link in std::path::Path::display())

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Diff for: compiler/rustc_trait_selection/src/solve/assembly.rs

@@ -173,6 +173,21 @@ pub(super) trait GoalKind<'tcx>: TypeFoldable<'tcx> + Copy + Eq {
         ecx: &mut EvalCtxt<'_, 'tcx>,
         goal: Goal<'tcx, Self>,
     ) -> QueryResult<'tcx>;
+
+    // The most common forms of unsizing are array to slice, and concrete (Sized)
+    // type into a `dyn Trait`. ADTs and Tuples can also have their final field
+    // unsized if it's generic.
+    fn consider_builtin_unsize_candidate(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx>;
+
+    // `dyn Trait1` can be unsized to `dyn Trait2` if they are the same trait, or
+    // if `Trait2` is a (transitive) supertrait of `Trait2`.
+    fn consider_builtin_dyn_upcast_candidates(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> Vec<CanonicalResponse<'tcx>>;
 }
 
 impl<'tcx> EvalCtxt<'_, 'tcx> {
@@ -303,6 +318,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             G::consider_builtin_future_candidate(self, goal)
         } else if lang_items.gen_trait() == Some(trait_def_id) {
             G::consider_builtin_generator_candidate(self, goal)
+        } else if lang_items.unsize_trait() == Some(trait_def_id) {
+            G::consider_builtin_unsize_candidate(self, goal)
         } else {
             Err(NoSolution)
         };
@@ -313,6 +330,14 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             }
             Err(NoSolution) => (),
         }
+
+        // There may be multiple unsize candidates for a trait with several supertraits:
+        // `trait Foo: Bar<A> + Bar<B>` and `dyn Foo: Unsize<dyn Bar<_>>`
+        if lang_items.unsize_trait() == Some(trait_def_id) {
+            for result in G::consider_builtin_dyn_upcast_candidates(self, goal) {
+                candidates.push(Candidate { source: CandidateSource::BuiltinImpl, result });
+            }
+        }
     }
 
     fn assemble_param_env_candidates<G: GoalKind<'tcx>>(

Diff for: compiler/rustc_trait_selection/src/solve/project_goals.rs

@@ -554,6 +554,20 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
             .to_predicate(tcx),
         )
     }
+
+    fn consider_builtin_unsize_candidate(
+        _ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx> {
+        bug!("`Unsize` does not have an associated type: {:?}", goal);
+    }
+
+    fn consider_builtin_dyn_upcast_candidates(
+        _ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> Vec<super::CanonicalResponse<'tcx>> {
+        bug!("`Unsize` does not have an associated type: {:?}", goal);
+    }
 }
 
 /// This behavior is also implemented in `rustc_ty_utils` and in the old `project` code.

Diff for: compiler/rustc_trait_selection/src/solve/trait_goals.rs

@@ -4,10 +4,11 @@ use std::iter;
 
 use super::assembly::{self, Candidate, CandidateSource};
 use super::infcx_ext::InferCtxtExt;
-use super::{Certainty, EvalCtxt, Goal, QueryResult};
+use super::{CanonicalResponse, Certainty, EvalCtxt, Goal, QueryResult};
 use rustc_hir::def_id::DefId;
 use rustc_infer::infer::InferCtxt;
 use rustc_infer::traits::query::NoSolution;
+use rustc_infer::traits::util::supertraits;
 use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
 use rustc_middle::ty::{self, ToPredicate, Ty, TyCtxt};
 use rustc_middle::ty::{TraitPredicate, TypeVisitable};
@@ -238,6 +239,206 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
             .to_predicate(tcx),
         )
     }
+
+    fn consider_builtin_unsize_candidate(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> QueryResult<'tcx> {
+        let tcx = ecx.tcx();
+        let a_ty = goal.predicate.self_ty();
+        let b_ty = goal.predicate.trait_ref.substs.type_at(1);
+        if b_ty.is_ty_var() {
+            return ecx.make_canonical_response(Certainty::AMBIGUOUS);
+        }
+        ecx.infcx.probe(|_| {
+            match (a_ty.kind(), b_ty.kind()) {
+                // Trait upcasting, or `dyn Trait + Auto + 'a` -> `dyn Trait + 'b`
+                (&ty::Dynamic(_, _, ty::Dyn), &ty::Dynamic(_, _, ty::Dyn)) => {
+                    // Dyn upcasting is handled separately, since due to upcasting,
+                    // when there are two supertraits that differ by substs, we
+                    // may return more than one query response.
+                    return Err(NoSolution);
+                }
+                // `T` -> `dyn Trait` unsizing
+                (_, &ty::Dynamic(data, region, ty::Dyn)) => {
+                    // Can only unsize to an object-safe type
+                    if data
+                        .principal_def_id()
+                        .map_or(false, |def_id| !tcx.check_is_object_safe(def_id))
+                    {
+                        return Err(NoSolution);
+                    }
+
+                    let Some(sized_def_id) = tcx.lang_items().sized_trait() else {
+                        return Err(NoSolution);
+                    };
+                    let nested_goals: Vec<_> = data
+                        .iter()
+                        // Check that the type implements all of the predicates of the def-id.
+                        // (i.e. the principal, all of the associated types match, and any auto traits)
+                        .map(|pred| goal.with(tcx, pred.with_self_ty(tcx, a_ty)))
+                        .chain([
+                            // The type must be Sized to be unsized.
+                            goal.with(
+                                tcx,
+                                ty::Binder::dummy(tcx.mk_trait_ref(sized_def_id, [a_ty])),
+                            ),
+                            // The type must outlive the lifetime of the `dyn` we're unsizing into.
+                            goal.with(tcx, ty::Binder::dummy(ty::OutlivesPredicate(a_ty, region))),
+                        ])
+                        .collect();
+
+                    ecx.evaluate_all_and_make_canonical_response(nested_goals)
+                }
+                // `[T; n]` -> `[T]` unsizing
+                (&ty::Array(a_elem_ty, ..), &ty::Slice(b_elem_ty)) => {
+                    // We just require that the element type stays the same
+                    let nested_goals = ecx.infcx.eq(goal.param_env, a_elem_ty, b_elem_ty)?;
+                    ecx.evaluate_all_and_make_canonical_response(nested_goals)
+                }
+                // Struct unsizing `Struct<T>` -> `Struct<U>` where `T: Unsize<U>`
+                (&ty::Adt(a_def, a_substs), &ty::Adt(b_def, b_substs))
+                    if a_def.is_struct() && a_def.did() == b_def.did() =>
+                {
+                    let unsizing_params = tcx.unsizing_params_for_adt(a_def.did());
+                    // We must be unsizing some type parameters. This also implies
+                    // that the struct has a tail field.
+                    if unsizing_params.is_empty() {
+                        return Err(NoSolution);
+                    }
+
+                    let tail_field = a_def
+                        .non_enum_variant()
+                        .fields
+                        .last()
+                        .expect("expected unsized ADT to have a tail field");
+                    let tail_field_ty = tcx.bound_type_of(tail_field.did);
+
+                    let a_tail_ty = tail_field_ty.subst(tcx, a_substs);
+                    let b_tail_ty = tail_field_ty.subst(tcx, b_substs);
+
+                    // Substitute just the unsizing params from B into A. The type after
+                    // this substitution must be equal to B. This is so we don't unsize
+                    // unrelated type parameters.
+                    let new_a_substs = tcx.mk_substs(a_substs.iter().enumerate().map(|(i, a)| {
+                        if unsizing_params.contains(i as u32) { b_substs[i] } else { a }
+                    }));
+                    let unsized_a_ty = tcx.mk_adt(a_def, new_a_substs);
+
+                    // Finally, we require that `TailA: Unsize<TailB>` for the tail field
+                    // types.
+                    let mut nested_goals = ecx.infcx.eq(goal.param_env, unsized_a_ty, b_ty)?;
+                    nested_goals.push(goal.with(
+                        tcx,
+                        ty::Binder::dummy(
+                            tcx.mk_trait_ref(goal.predicate.def_id(), [a_tail_ty, b_tail_ty]),
+                        ),
+                    ));
+
+                    ecx.evaluate_all_and_make_canonical_response(nested_goals)
+                }
+                // Tuple unsizing `(.., T)` -> `(.., U)` where `T: Unsize<U>`
+                (&ty::Tuple(a_tys), &ty::Tuple(b_tys))
+                    if a_tys.len() == b_tys.len() && !a_tys.is_empty() =>
+                {
+                    let (a_last_ty, a_rest_tys) = a_tys.split_last().unwrap();
+                    let b_last_ty = b_tys.last().unwrap();
+
+                    // Substitute just the tail field of B., and require that they're equal.
+                    let unsized_a_ty = tcx.mk_tup(a_rest_tys.iter().chain([b_last_ty]));
+                    let mut nested_goals = ecx.infcx.eq(goal.param_env, unsized_a_ty, b_ty)?;
+
+                    // Similar to ADTs, require that the rest of the fields are equal.
+                    nested_goals.push(goal.with(
+                        tcx,
+                        ty::Binder::dummy(
+                            tcx.mk_trait_ref(goal.predicate.def_id(), [*a_last_ty, *b_last_ty]),
+                        ),
+                    ));
+
+                    ecx.evaluate_all_and_make_canonical_response(nested_goals)
+                }
+                _ => Err(NoSolution),
+            }
+        })
+    }
+
+    fn consider_builtin_dyn_upcast_candidates(
+        ecx: &mut EvalCtxt<'_, 'tcx>,
+        goal: Goal<'tcx, Self>,
+    ) -> Vec<CanonicalResponse<'tcx>> {
+        let tcx = ecx.tcx();
+
+        let a_ty = goal.predicate.self_ty();
+        let b_ty = goal.predicate.trait_ref.substs.type_at(1);
+        let ty::Dynamic(a_data, a_region, ty::Dyn) = *a_ty.kind() else {
+            return vec![];
+        };
+        let ty::Dynamic(b_data, b_region, ty::Dyn) = *b_ty.kind() else {
+            return vec![];
+        };
+
+        // All of a's auto traits need to be in b's auto traits.
+        let auto_traits_compatible =
+            b_data.auto_traits().all(|b| a_data.auto_traits().any(|a| a == b));
+        if !auto_traits_compatible {
+            return vec![];
+        }
+
+        let mut unsize_dyn_to_principal = |principal: Option<ty::PolyExistentialTraitRef<'tcx>>| {
+            ecx.infcx.probe(|_| -> Result<_, NoSolution> {
+                // Require that all of the trait predicates from A match B, except for
+                // the auto traits. We do this by constructing a new A type with B's
+                // auto traits, and equating these types.
+                let new_a_data = principal
+                    .into_iter()
+                    .map(|trait_ref| trait_ref.map_bound(ty::ExistentialPredicate::Trait))
+                    .chain(a_data.iter().filter(|a| {
+                        matches!(a.skip_binder(), ty::ExistentialPredicate::Projection(_))
+                    }))
+                    .chain(
+                        b_data
+                            .auto_traits()
+                            .map(ty::ExistentialPredicate::AutoTrait)
+                            .map(ty::Binder::dummy),
+                    );
+                let new_a_data = tcx.mk_poly_existential_predicates(new_a_data);
+                let new_a_ty = tcx.mk_dynamic(new_a_data, b_region, ty::Dyn);
+
+                // We also require that A's lifetime outlives B's lifetime.
+                let mut nested_obligations = ecx.infcx.eq(goal.param_env, new_a_ty, b_ty)?;
+                nested_obligations.push(
+                    goal.with(tcx, ty::Binder::dummy(ty::OutlivesPredicate(a_region, b_region))),
+                );
+
+                ecx.evaluate_all_and_make_canonical_response(nested_obligations)
+            })
+        };
+
+        let mut responses = vec![];
+        // If the principal def ids match (or are both none), then we're not doing
+        // trait upcasting. We're just removing auto traits (or shortening the lifetime).
+        if a_data.principal_def_id() == b_data.principal_def_id() {
+            if let Ok(response) = unsize_dyn_to_principal(a_data.principal()) {
+                responses.push(response);
+            }
+        } else if let Some(a_principal) = a_data.principal()
+            && let Some(b_principal) = b_data.principal()
+        {
+            for super_trait_ref in supertraits(tcx, a_principal.with_self_ty(tcx, a_ty)) {
+                if super_trait_ref.def_id() != b_principal.def_id() {
+                    continue;
+                }
+                let erased_trait_ref = super_trait_ref
+                    .map_bound(|trait_ref| ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref));
+                if let Ok(response) = unsize_dyn_to_principal(Some(erased_trait_ref)) {
+                    responses.push(response);
+                }
+            }
+        }
+
+        responses
+    }
 }
 
 impl<'tcx> EvalCtxt<'_, 'tcx> {

Diff for: compiler/rustc_trait_selection/src/traits/const_evaluatable.rs

@@ -219,7 +219,7 @@ fn satisfied_from_param_env<'tcx>(
     }
 
     if let Some(Ok(c)) = single_match {
-        let ocx = ObligationCtxt::new(infcx);
+        let ocx = ObligationCtxt::new_in_snapshot(infcx);
         assert!(ocx.eq(&ObligationCause::dummy(), param_env, c.ty(), ct.ty()).is_ok());
         assert!(ocx.eq(&ObligationCause::dummy(), param_env, c, ct).is_ok());
         assert!(ocx.select_all_or_error().is_empty());

Diff for: compiler/rustc_ty_utils/src/ty.rs

@@ -426,10 +426,6 @@ fn unsizing_params_for_adt<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> BitSet<u32
         },
     };
 
-    // FIXME(eddyb) cache this (including computing `unsizing_params`)
-    // by putting it in a query; it would only need the `DefId` as it
-    // looks at declared field types, not anything substituted.
-
     // The last field of the structure has to exist and contain type/const parameters.
     let Some((tail_field, prefix_fields)) =
         def.non_enum_variant().fields.split_last() else

Diff for: library/core/src/future/mod.rs

@@ -56,51 +56,6 @@ unsafe impl Send for ResumeTy {}
 #[unstable(feature = "gen_future", issue = "50547")]
 unsafe impl Sync for ResumeTy {}
 
-/// Wrap a generator in a future.
-///
-/// This function returns a `GenFuture` underneath, but hides it in `impl Trait` to give
-/// better error messages (`impl Future` rather than `GenFuture<[closure.....]>`).
-// This is `const` to avoid extra errors after we recover from `const async fn`
-#[doc(hidden)]
-#[unstable(feature = "gen_future", issue = "50547")]
-#[rustc_const_unstable(feature = "gen_future", issue = "50547")]
-#[inline]
-pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
-where
-    T: crate::ops::Generator<ResumeTy, Yield = ()>,
-{
-    use crate::{
-        ops::{Generator, GeneratorState},
-        pin::Pin,
-        task::Poll,
-    };
-
-    #[rustc_diagnostic_item = "gen_future"]
-    struct GenFuture<T: Generator<ResumeTy, Yield = ()>>(T);
-
-    // We rely on the fact that async/await futures are immovable in order to create
-    // self-referential borrows in the underlying generator.
-    impl<T: Generator<ResumeTy, Yield = ()>> !Unpin for GenFuture<T> {}
-
-    impl<T: Generator<ResumeTy, Yield = ()>> Future for GenFuture<T> {
-        type Output = T::Return;
-        #[track_caller]
-        fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
-            // SAFETY: Safe because we're !Unpin + !Drop, and this is just a field projection.
-            let gen = unsafe { Pin::map_unchecked_mut(self, |s| &mut s.0) };
-
-            // Resume the generator, turning the `&mut Context` into a `NonNull` raw pointer. The
-            // `.await` lowering will safely cast that back to a `&mut Context`.
-            match gen.resume(ResumeTy(NonNull::from(cx).cast::<Context<'static>>())) {
-                GeneratorState::Yielded(()) => Poll::Pending,
-                GeneratorState::Complete(x) => Poll::Ready(x),
-            }
-        }
-    }
-
-    GenFuture(gen)
-}
-
 #[lang = "get_context"]
 #[doc(hidden)]
 #[unstable(feature = "gen_future", issue = "50547")]

Diff for: library/std/src/path.rs

@@ -2688,6 +2688,7 @@ impl Path {
     /// escapes the path please use [`Debug`] instead.
     ///
     /// [`Display`]: fmt::Display
+    /// [`Debug`]: fmt::Debug
     ///
     /// # Examples
     ///